Last Activity:01-18-2017 2:02 PM
Likes Given: 10
66 Likes on 53 Posts
Posted in thread: PatWankel Rotary Engine on 01-12-2017 at 12:11 PM
Thanks. For some reason I didn't realize that the seals were in the outer case. However,
everything I said about an accurate and smooth surface is still true. It just needs to be on
the inner element....
Posted in thread: Timing for SI 2-stroke? on 01-12-2017 at 12:01 PM
QUB is Queens University of Belfast. The late Gordon Blair did a lot of the basic research
there that lead to the modern two stroke design. Unlike most two stroke developers, he
published his work and...
Posted in thread: Timing for SI 2-stroke? on 01-11-2017 at 04:15 PM
This may be a little late, but a better design for a cross flow scavenged engine is the QUB
crossflow design. It has a better combustion chamber shape and should be easier to
Posted in thread: PatWankel Rotary Engine on 01-11-2017 at 12:49 PM
I doubt that milling will leave an accurate and smooth enough surface on the outer case to get
good sealing. However, a CNC grinding machine should be able to produce an accurate surface in
the same w...
Posted in thread: PatWankel Rotary Engine on 01-10-2017 at 02:27 PM
Fascinating. The problem with the Wankel, Liquid Piston, and similar concepts has always been
sealing. Their designs were 2D concepts that could be made accurately with 20th century
methods. However, ...
Posted in thread: piston ring materials on 12-03-2016 at 03:23 PM
I got the very small amount of ductile cast iron I needed from McMaster-Carr. While I'm just
starting to make rings, the machining process seems to go very well. The usual recommendation
Posted in thread: Materials search on 09-30-2016 at 02:36 PM
McMaster Carr usually has most common things including bearing balls and springs. Boca Bearings
is a great source of all kinds of rolling element bearings and parts. Associated Spring has
lots of diff...
Posted in thread: Model Engine Maker on 09-26-2016 at 09:51 PM
What happened to modelenginemaker.com?Lohring Miller
Posted in thread: CAMBIELA engine on 09-25-2016 at 01:49 PM
A simpler system would be the epicycloid crank mechanism. The crankpin rotates the small gear
around the ring gear and the eccentric gives a straight reciprocating action to the rod in the
Posted in thread: Rotary Table vs Dividing Head ? on 09-17-2016 at 02:40 PM
I only have a dividing head with a screw on chuck. I use it all the time to machine accurate
arcs. It's easiest to machine an arc that's concentric with another round area that can be held
in the chuc...